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DHCP is the protocol that dispenses IP addresses while DNS resolves hostnames into IP addresses.

If your WIN9x machines continue to work fine but the W2K does not then it does not seem that your router or DNS service is this problem.

Let's go back to the PC's themselves. Turn off any power management features within W2K and within the BIOS of the PC. Power management causes all kinds of weird problems. Are you using built in network adapters or did you put adapters in a slot. Do you have the latest drivers for these adapters. What speed are the adapters and what speed are the ports on the router? If gigabit or fast ethernet try to take one of the connections back down to 10Mb and see if you continue to have the problem on that machine. Once again I never direct connect my PC's to a router but put a hub or switch in between them (switch is better).

It may be Monday before I can check back.

The internet just went down on the 2 W2K machines. Every request returns a DNS error. I typed FR's IP address into the address bar and FR pops up other than the graphics that are, I'm guessing, stored on another server. Can I assume that the error is being caused by some failure of the W2K's DNS handling? The web applications that were loaded in the morning continue to function.